Gravity backdraft damper with galvanized steel collar and lightweight aluminum damper blades. Spring loaded for assistance in gravity closure. For optimum performance, damper should be installed in a vertical orientation. For dampers installed in a horizontal position, the hinge should be vertical

Gravity backdraft damper with galvanized steel collar and lightweight aluminum damper blades. Spring loaded for assistance in gravity closure. For optimum performance, damper should be installed in a vertical orientation. For dampers installed in a horizontal position, the hinge should be vertical